YOU GUYS IT'S CANON, JAESHIN IS WEAK TO CUTE LITTLE THINGS OMG The fact that he has a habit of taking cute little pets home is so endearing. Also his bantering with his brothers mother (my theory is that she probably also like his second mom, idk their brief interactions is so cute to me and the way she claims jaeshin liking pretty, little things is because he got it from her is adorable af lol)
Also yoooo, what a twist that the main reason why lee nok probably fell in love with his childhood friend in the first place is because he reminded him of jaeshin